SA vs TSA in OSPF

Discussion in 'Cisco' started by Ghazan Haider, Feb 27, 2005.

  1. Is the ONLY difference between stub area and totally stub area in
    OSPF, the exclusion of non-default-route type 3 LSAs in totally stub
    areas??

    In other words:

    Does a stubby area require a single ABR? Does 2 ABRs disqualify an
    area from being stubby? If so, then either OSPF's designers screwed up
    by allowing inter-area routes (type 3) into the area, which is
    useless, and a single defaultroute will do.. so cisco really fixed
    that up by adding a totally stubby area, sortof like the cisco
    framerelay encap type which is better than the standard...

    or maybe OSPF's designers didnt want to add a default route where
    there is none, so all routers in a stubby area should give 'route
    unreachable' since the ABRs only send in inter-area routes, while
    cisco makes do without this feature by using a default route even if
    theres none, in a totally stubby area, just to cut down further on
    LSAs... depending on routers outside that area to reply with a 'route
    unreachable'...

    I'm just not sure why a stubby area is NOT a totally stubby area, and
    why did cisco HAVE to add a totally stubby area and not ospf
    themselves. These sybex books arent helping in that direction
    Ghazan Haider, Feb 27, 2005
    #1
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